Stem, Branch and Branchlet: Shape: Subtetragonal

species of common characteristics :

1. Catharanthus roseus (L.) G. Don--長春花
   
    
2. Handroanthus chrysanthus (Jacq.) S.O.Grose--黃花風鈴木
   
    
3. Stachytarpheta cayennensis (Rich.) Vahl--藍蝶猿尾木
   
    
4. Tabebuia aurea (Silva Manso) Benth. & Hook.f. ex S.Moore--銀鱗風鈴木